Give Me Back My Key
Another sinister set of monsters you encounter in Little Nightmares are the Twin Chefs. At one point in the game, you have to retrieve a key from right under the deformed noses of these beasts. As you can see, they're not going to let you walk away so easily.
Despite her best efforts, Six is eventually captured and locked away in a cage by The Janitor. This image may be simple, but it's nevertheless a frightening premise to find yourself trapped in total darkness.
Get Back Here!
The moment that stressed us out the most in Little Nightmares is having to run past a row of hungry Guests. As you can see in the image above, they'd prefer if you let them devour you Attack on Titan style.